FishTankHelper

Can two bettas live together?

By Andy · Updated October 31, 2026 · Tankmate guide

No, they don't mix. Two male bettas fight, often to the death. Keep one male per tank.

Betta (male) in a planted aquarium
A koi betta in one of my tanks.
No
Verdict
76–82°F
Shared temperature
5 gal
Smallest tank

The fish

FishAdult sizeTemperatureMin. tankKeepWatch for
Betta (male)2.5 in76–82°F5 galAlone or as a pairlong fins

If they are already together

Good tankmates instead

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Related: Betta care · Fish compatibility checker · Fish care sheets